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[SCSI] megaraid_sas: intercept cmd timeout and throttle io

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eh_timed_out call back (megasas_reset_timer) is used to throttle io
to the adapter when it is called the first time for a scmd.
The MEGASAS_FW_BUSY flag is set and can_queue reduced to 16.
The can_queue is restored from completion routine in following
two conditions : 5 seconds has elapsed and
the # of outstanding cmds in FW is < 17.

Signed-off-by: Sumant Patro <sumant.patro@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Sumant Patro 2007-05-17 05:47:51 -07:00 committed by James Bottomley
parent 3d9780b976
commit 05e9ebbefb
2 changed files with 69 additions and 12 deletions
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67
drivers/scsi/megaraid/megaraid_sas.c
View file

@ -10,7 +10,7 @@
* 2 of the License, or (at your option) any later version.
*
* FILE : megaraid_sas.c
* Version : v00.00.03.10-rc1
* Version : v00.00.03.10-rc5
*
* Authors:
* (email-id : megaraidlinux@lsi.com)
@ -886,6 +886,7 @@ megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
goto out_return_cmd;
cmd->scmd = scmd;
scmd->SCp.ptr = (char *)cmd;
/*
* Issue the command to the FW
@ -919,7 +920,7 @@ static int megasas_slave_configure(struct scsi_device *sdev)
* The RAID firmware may require extended timeouts.
*/
if (sdev->channel >= MEGASAS_MAX_PD_CHANNELS)
sdev->timeout = 90 * HZ;
sdev->timeout = MEGASAS_DEFAULT_CMD_TIMEOUT * HZ;
return 0;
}
@ -981,8 +982,8 @@ static int megasas_generic_reset(struct scsi_cmnd *scmd)
instance = (struct megasas_instance *)scmd->device->host->hostdata;
scmd_printk(KERN_NOTICE, scmd, "megasas: RESET -%ld cmd=%x\n",
scmd->serial_number, scmd->cmnd[0]);
scmd_printk(KERN_NOTICE, scmd, "megasas: RESET -%ld cmd=%x retries=%x\n",
scmd->serial_number, scmd->cmnd[0], scmd->retries);
if (instance->hw_crit_error) {
printk(KERN_ERR "megasas: cannot recover from previous reset "
@ -999,6 +1000,39 @@ static int megasas_generic_reset(struct scsi_cmnd *scmd)
return ret_val;
}
/**
* megasas_reset_timer - quiesce the adapter if required
* @scmd: scsi cmnd
*
* Sets the FW busy flag and reduces the host->can_queue if the
* cmd has not been completed within the timeout period.
*/
static enum
scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
{
struct megasas_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr;
struct megasas_instance *instance;
unsigned long flags;
if (time_after(jiffies, scmd->jiffies_at_alloc +
(MEGASAS_DEFAULT_CMD_TIMEOUT * 2) * HZ)) {
return EH_NOT_HANDLED;
}
instance = cmd->instance;
if (!(instance->flag & MEGASAS_FW_BUSY)) {
/* FW is busy, throttle IO */
spin_lock_irqsave(instance->host->host_lock, flags);
instance->host->can_queue = 16;
instance->last_time = jiffies;
instance->flag |= MEGASAS_FW_BUSY;
spin_unlock_irqrestore(instance->host->host_lock, flags);
}
return EH_RESET_TIMER;
}
/**
* megasas_reset_device - Device reset handler entry point
*/
@ -1112,6 +1146,7 @@ static struct scsi_host_template megasas_template = {
.eh_device_reset_handler = megasas_reset_device,
.eh_bus_reset_handler = megasas_reset_bus_host,
.eh_host_reset_handler = megasas_reset_bus_host,
.eh_timed_out = megasas_reset_timer,
.bios_param = megasas_bios_param,
.use_clustering = ENABLE_CLUSTERING,
};
@ -1215,9 +1250,8 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
int exception = 0;
struct megasas_header *hdr = &cmd->frame->hdr;
if (cmd->scmd) {
cmd->scmd->SCp.ptr = (char *)0;
}
if (cmd->scmd)
cmd->scmd->SCp.ptr = NULL;
switch (hdr->cmd) {
@ -1806,6 +1840,7 @@ static void megasas_complete_cmd_dpc(unsigned long instance_addr)
u32 context;
struct megasas_cmd *cmd;
struct megasas_instance *instance = (struct megasas_instance *)instance_addr;
unsigned long flags;
/* If we have already declared adapter dead, donot complete cmds */
if (instance->hw_crit_error)
@ -1828,6 +1863,22 @@ static void megasas_complete_cmd_dpc(unsigned long instance_addr)
}
*instance->consumer = producer;
/*
* Check if we can restore can_queue
*/
if (instance->flag & MEGASAS_FW_BUSY
&& time_after(jiffies, instance->last_time + 5 * HZ)
&& atomic_read(&instance->fw_outstanding) < 17) {
spin_lock_irqsave(instance->host->host_lock, flags);
instance->flag &= ~MEGASAS_FW_BUSY;
instance->host->can_queue =
instance->max_fw_cmds - MEGASAS_INT_CMDS;
spin_unlock_irqrestore(instance->host->host_lock, flags);
}
}
/**
@ -2398,6 +2449,8 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
instance->init_id = MEGASAS_DEFAULT_INIT_ID;
megasas_dbg_lvl = 0;
instance->flag = 0;
instance->last_time = 0;
/*
* Initialize MFI Firmware

14
drivers/scsi/megaraid/megaraid_sas.h
View file

@ -18,9 +18,9 @@
/*
* MegaRAID SAS Driver meta data
*/
#define MEGASAS_VERSION "00.00.03.10-rc1"
#define MEGASAS_RELDATE "Feb 14, 2007"
#define MEGASAS_EXT_VERSION "Wed Feb 14 10:14:25 PST 2007"
#define MEGASAS_VERSION "00.00.03.10-rc5"
#define MEGASAS_RELDATE "May 17, 2007"
#define MEGASAS_EXT_VERSION "Thu May 17 10:09:32 PDT 2007"
/*
* Device IDs
@ -539,6 +539,8 @@ struct megasas_ctrl_info {
#define MEGASAS_DBG_LVL 1
#define MEGASAS_FW_BUSY 1
/*
* When SCSI mid-layer calls driver's reset routine, driver waits for
* MEGASAS_RESET_WAIT_TIME seconds for all outstanding IO to complete. Note
@ -549,8 +551,8 @@ struct megasas_ctrl_info {
#define MEGASAS_RESET_WAIT_TIME 180
#define MEGASAS_INTERNAL_CMD_WAIT_TIME 180
#define MEGASAS_RESET_NOTICE_INTERVAL 5
#define MEGASAS_IOCTL_CMD 0
#define MEGASAS_DEFAULT_CMD_TIMEOUT 90
/*
* FW reports the maximum of number of commands that it can accept (maximum
@ -1073,7 +1075,6 @@ struct megasas_instance {
struct megasas_register_set __iomem *reg_set;
s8 init_id;
u8 reserved[3];
u16 max_num_sge;
u16 max_fw_cmds;
@ -1104,6 +1105,9 @@ struct megasas_instance {
struct megasas_instance_template *instancet;
struct tasklet_struct isr_tasklet;
u8 flag;
unsigned long last_time;
};
#define MEGASAS_IS_LOGICAL(scp) \